Cooling of high potential apparatus



r-m1 w, m. G B; HAG -Q 1,999,234

COOLING OF HIGH POTENTIAL APPARATUS Filed March l2, 1931 INVENTOR GERHARD B. HAGEN ATTORNEY Patented Apr. 30, 1935 UNITED STATES PATENT OFFICE COQLING F PEG POTENTIAL APPARATUS tion of Germany Application March 12, 1931, Serial No. 521,948 In Germany March 12, 1930 1 Claim.

It is known in the art that for certain types of discharge vessels such as Roentgen-ray tubes, electron tubes, especially when used for transmitter outfits, rectifier tubes, etc., it is necessary to chill or cool those electrodes which are subjected to marked heating in actual use. According to the prior art cooling liquid has been supplied through long rubber hose to the discharge vessel, particularly water or oil.

Now, inasmuch as the electrodes to be cooled often are at a relatively high potential, it has been found that rubber is unserviceable since it is subject to the attacks by the ozone generated by silent discharges occasioned by the action of high potentials.

To obviate this inconvenience is an object of this invention and it is proposed according to the present invention to make the supply tubing conducting the cooling liquid for the tube from inorganic insulation material. In the case of a practical use as here mentioned it is especially recommendable to utilize porcelain or glass tubing.

However, since the attaching of rigid tubing to the discharge vessel may under certain circumstances be attended with difficulties owing to the production of mechanical stresses, it is further proposed, according to this invention to interpose elastic means or pieces, that is to say, short pieces of lead pipe or rubber hose. When using intermediate pieces of rubber hose or tubing it is suitable to insert these not near the high-potential connection of the tube, but rather at the grounded end thereof.

The invention is schematically illustrated in the accompanying drawing wherein Figure 1 illustrates the present invention applied to a single high powered transmitting tube, and,

Figure 2 illustrates the present invention applied to a push-pull arrangement of power tubes.

Referring to Figure l, A denotes the wall of a vessel through which cooling fluid passes. The vessel A ordinarily takes the form of anode of a large power transmitter tube. Inlet and outlet tubes R1 and R2, or an inorganic non-conductive or insulating material such as glass or porcelain, are provided for supplying cooling fluid to and taking it away from the vessel A. Flexible or elastic interposed tubular pieces Z1, Z2 are inserted as shown, Z1 being made preferably of lead and Z2 of rubber. If desired, a rubber feed pipe may be applied to the far end of tube B1 and, if desired, a lead or other soft metal tube may be interposed between R2 and vessel A. The fluid conductor 22 may, of course, be kept at a ground potential and, because it is insulated from the high potential anode wall A, it will not be subject to disintegration due to either the steady anode potential or high frequency anode potentials.

The present invention may be applied equally to anodes of push-pull connected tubes which are paralleled electrically for steady anode potential and serially connected for a cooling fluid by cooling coils such as shown in Figure 2. There, coils 2, l parallel the anodes 5, 8 for anode unidirectional potential, the potential being supplied from a source W to conductor 52 and connecting pipes M connected intermediate the ends of coils 2, d, and preferably to the electrical center thereof. Water or other cooling fluid flows through the elements as indicated by the arrows.

In series with the inlet and outlet pipes it there are connected glass, porcelain, or other inorganic insulating material pipes or tubes l5, l8 supported by a suitable support 2!]. Inlet and outlet tubes 22, 24 which may be of any material, preferably of rubber for ease of connection, may then be directly coupled to the coupling pipes it, It for the purpose of supplying suitable cooling fluid inlets and outlets.

In this manner, the high unidirectional potential from source ii? is prevented, by means of insulating pipes or conduits iii, it from being applied to the connecting lines 22, 24 thereby preventing application thereto of undesired potentials and their concomitant ill effects thereupon.

I claim:

In combination, two electron discharge devices having a fluid cooled anode vessel adapted for cooling, said vessel comprising a fluid inlet and outlet, said devices connected in a push-pull manner so that they are electrically connected in parallel for a steady anode potential, but serially connected for a cooling fluid by two cooling coils, said cooling coils being connected in parallel to the anode vessels of said electron discharge devices, means for supplying a uni-directional potential to said coils and two fluid supply pipes connected to the electrical center of said cooling coils, and a pair of rigid inorganic tubes in series with said fluid supply pipes and the source of cooling supply means.

GERHARD B. HAGEN. 

